Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1a07d39b91cb23…

MALICIOUS

PDF

93.8 KB Created: 2021-07-28 04:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 969d984fdb5990ae3a13164efcb3c694 SHA-1: dbbf128d77a5501965de9118a12f70b93f626fe6 SHA-256: bb1a07d39b91cb23579fb279e818f60b06b8021703f64e33aea81e514c6c0a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://antwerp-reefer-tournament.be/argt/files/85902026897.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083260441390---demeturim.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16091141003d31---10139209799.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5b193f56---zikiwu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-7/20210707140944726663.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/48140561431.pdfIn PDF document text
    • https://lecachet.fr/docs/files/66566169907.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/dosisixewakizimimejeweb.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2890c04f9f3028ee0f409984fd41faf6/riniboxerinujasez.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5f2673df70416c288c41e8f436eaaad8/45075319543.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kidigaxukemawepebi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6ee27d97---39602909116.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/41304775396.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160850524b0c40---94535927159.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62a3a3110---xejol.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a597ba44baa---losufidenakezu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pijagotulatumen.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/zavupotugebifivulizives.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/56330742474.pdfIn PDF document text
    • https://davaocarrental.com/images/file/25649433301.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/nasanepanekudimugejap.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/xubanuzevinapaf.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/fezizujanoxakiwaxogejoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=instructions+for+sears+kenmore+self+cleaning+ovenPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 19180 bytes
SHA-256: f482cba5feac3aa78cc78bd205c678a323a1328a0e269df96f418c28abcebd98
font_02_sfnt_off00014f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F27 10888 bytes
SHA-256: e5ae92067534e08f570903d8713116f1257e05c2223521e63fe16c8cc7e5e937